By Andrew MacAskill and Huw Jones

LONDON (Reuters) - Britain's shadow chancellor John McDonnell offered a new pact with the financial services industry on Thursday: higher taxes in return for a seat at the policymaking table if Labour wins the next election.

McDonnell, a veteran socialist who has won over many voters with his promises to re-nationalize services and increase public spending, said he wanted a "new start" in relations with London's lucrative financial sector.

"There are some policies that you will like and some which you will be less enthusiastic about," he told a conference on the future of finance in London.


"I don't expect some people to be overjoyed at having to pay a bit more in income tax or corporation tax or at the introduction of a Financial Transaction Tax."

With opinion polls showing Labour level with Prime Minister Theresa May's Conservatives, finance executives are increasingly focused on what a government under left-wing leader Jeremy Corbyn and McDonnell could mean for the City if the next scheduled election in 2022 went their way.

Despite his previous antipathy towards bankers, McDonnell is trying to win the support of financial leaders just as former Labour leader Tony Blair helped prepare his party for power with what was dubbed the "prawn cocktail offensive" in the 1990s.

However, McDonnell was clear that the party will seek to extract more revenue from the City of London, including proposals to expand an existing tax on shares to trading on other assets such as bonds and derivatives.

In return, McDonnell said Labour government would offer the finance sector a chance to influence policies.

Joking that finance executives might expect to meet "a raving extremist who is about to nationalize their company and send them on a re-education course," McDonnell said that instead he wanted them to work with him.

"I make no apology for believing in the need for finance to serve the wider economy rather than becoming the over-powerful master of everything else," he said.

"There have always been many people in the finance sector who understand and share that belief."

McDonnell has already met executives from Standard Chartered, Barclays and the London Stock Exchange, in what has been dubbed a "cup of tea offensive" to court the support of financial leaders.

Under Corbyn and McDonnell, Labour has shifted from the centrist pro-business platform of former prime minister Blair to being more left-wing.

McDonnell said his party was ready to be a "radical, intervening" government, including in the finance sector.

In a separate speech on Thursday, Corbyn promised to build a million "genuinely affordable" homes over a decade.

Labour said that its proposals were aimed at making affordable housing available to people on ordinary incomes.

"When housing has become a site of speculation for a wealthy few, leaving the many unable to access a decent, secure home, something has gone seriously wrong," he said.

"We need to restore the principle that a decent home is a right owed to all, not a privilege for the few."

(Reporting by Andrew MacAskill editing by William James/Guy Faulconbridge)

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